LASER PHOSPHORESCENCE EXCITATION SPECTRA OF 2, 4 and 2, 5 DIMETHYLBENZALDEHYDE IN THE PRESENCE OF AN ELECTRIC FIELD
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Date
1982
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Ohio State University
Abstract
Recent studies of the electric field effect on several bands of the laser induced phosphorescence excitation spectrum of 2, 4, 5-trimethylbenzaldehyde, isolated in a durene single crystal, revealed that the dipole moment associated with the most intense feature in the spectrum was the same, within experimental uncertainty, as that for the $T_{1}(n\pi\ast)$ phosphorescence $origin^{1}$. This result seems to indicate that either the assignment of this feature to the $T_{2}(n\pi\ast)$ state is incorrect or that the $T_{2}(n\pi\ast)$ state is strongly coupled to a set of $T_{1}(n\pi\ast)$ vibronic levels. In order to determine the origin and generality of this result, we have mesured the electric field effect on the phosphorescence excitation spectra of 2, 4 and 2, 5-dimethylbenzaldehyde. The results of these experiments will be presented and compared with those for trimethylbenzaldehyde.
Description
1. Irwin C. Winkler and David M. Hanson, J. Am. Chem, Soc., 103, 6264 (1981)